Here's why:
* Different Game Versions: The two games are distinct versions, not compatible for trading like in mainline Pokémon games.
* No Trading Feature: The games do not have a built-in trading feature.
Workarounds:
While you can't trade directly, there are ways to get Pokémon from one game to another:
* Breeding: If you have both Red and Blue versions, you can breed Pokémon with compatible abilities and moves in one game and then transfer the eggs to the other game. This can help you get Pokémon with desirable traits in both games.
* Game Sharing: You can play the same save file on both Red and Blue, allowing you to access the same Pokémon and progress in both games.
Note: These workarounds still require you to own both versions of the game.